Science : Ch 11 – The Human Eye and the Colourful World

This test is designed based on NCERT Syllabus for Class 10 Topics : The Human Eye and the Colourful World

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

A clear sky appears blue, because:

blue light gets absorbed in the atmosphere

ultraviolet radiations are absorbed in the atmosphere

violet and blue lights get scattered more than the lights of all other colours by the atmosphere

lights of all other colours is scattered more than the violet and blue colour lights by the atmosphere

2 / 15

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

is scattered the most by smoke or fog

is scattered the least by smoke or fog

is absorbed the most by smoke or fog

moves the fastest in air

3 / 15

The bluish colour of water in deep sea is due to:

the presence of algae and other plants found in water

refection of the sky in water

scattering of light

absorption of light by the sea

4 / 15

In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray

is parallel to the incident ray.

is along the same direction of incident ray

gets deviated and bends towards the thinner part of the prism.

gets deviated and bends towards the thicker part (base) of the prism.

5 / 15

The sun appears red at sunset or sunrise. Choose the incorrect statement from the following

Light from the sun near the horizon passes through the layers of air.

Light from the sun near the horizon travels larger distance in the earth’s atmosphere before reaching our eyes. (c)

Most of the blue light and longer wavelengths are scattered away by the particles.

Most of the blue light and shorter wavelengths are scattered away by the

6 / 15

A student traces the path of a ray of light through a triangular glass prism for diferent values of angle of incidence. On analysing the ray diagrams, which one of the following conclusions is he likely to draw?

The emergent ray is parallel to the incident ray

The emergent ray bends at an angle to the direction of the incident ray

The emergent ray and the refracted ray are at right angles to each other.

The emergent ray is perpendicula

7 / 15

Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon,name the phenomeoneon

Atmospheric refraction

Atmospheric reflection

Atmospheric dispersion

none

8 / 15

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

Rainbow formation,Tyndall effect

Twinkling of stars, advance sunrise, delayed sunset

both 1 &2

none

9 / 15

Why don’t planets twinkle?

Intensity of light entering our eye is infinity

Intensity of light entering our eye is one.

Intensity of light entering our eye is zero.

Intensity of light entering our eye is two.

10 / 15

Light which consists of only one colour or single wavelength is called Monochromatic

Single chromatic

Dichromatic

Monochromatic

none

11 / 15

The splitting of light into its component colours is called

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

12 / 15

The density of the atmosphere, as we know goes on decreasing as the distance above the sea level increases,this phenomeneon is called

Atmospheric refraction

Refraction of light

Atmospheric Reflection

None

13 / 15

The defect the eye cannot focus objects both horizontally and vertically at the same time

Far – sightedness

Myopia

Astigmatism

none

14 / 15

Rainbow is caused due to

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

15 / 15

The sky appears black to an astronaut as there is no

refraction of light

scattering of light

reflection of light

Dispersion of light

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Science : Ch 11 – The Human Eye and the Colourful World

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